Hydrodynamic and Heat Transfer Effects of Different Sparger Spacings Within a Column Photobioreactor Using Computational Fluid Dynamics

Bari, Ghazi S.; Gent, Stephen P.; Suess, Taylor N.; Anderson, Gary A.

doi:10.1115/imece2012-87898

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to this difference in the characteristic times and the very low penetration depth of infrared radiation, one can include radiative heat transfer via boundary conditions in terms of temperature or heat flux [118]. Regarding the short mixing times in photobioreactors with small dimensions, one can even assume an almost homogeneous temperature distribution, which was also confirmed experimentally [119,120]. In this case, it is justified to ignore spatial dependencies and to assume isothermal conditions instead, i.e., excluding heat transfer calculations from CFD models.…”

Section: Heat Transfermentioning

confidence: 84%

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Luzi¹,

McHardy

2022

Energies

View full text Add to dashboard Cite

Computational Fluid Dynamics (CFD) have been frequently applied to model the growth conditions in photobioreactors, which are affected in a complex way by multiple, interacting physical processes. We review common photobioreactor types and discuss the processes occurring therein as well as how these processes have been considered in previous CFD models. The analysis reveals that CFD models of photobioreactors do often not consider state-of-the-art modeling approaches. As a comprehensive photobioreactor model consists of several sub-models, we review the most relevant models for the simulation of fluid flows, light propagation, heat and mass transfer and growth kinetics as well as state-of-the-art models for turbulence and interphase forces, revealing their strength and deficiencies. In addition, we review the population balance equation, breakage and coalescence models and discretization methods since the predicted bubble size distribution critically depends on them. This comprehensive overview of the available models provides a unique toolbox for generating CFD models of photobioreactors. Directions future research should take are also discussed, mainly consisting of an extensive experimental validation of the single models for specific photobioreactor geometries, as well as more complete and sophisticated integrated models by virtue of the constant increase of the computational capacity.

show abstract

Section: Heat Transfermentioning

confidence: 84%

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Luzi¹,

McHardy

2022

Energies

View full text Add to dashboard Cite

show abstract

“…The interphase heat exchange between gas and liquid phase in the two-fluid model is modeled as a function of temperature difference between the phases and the heat transfer coefficient. The heat transfer coefficient is modeled using the correlation by Ranz and Marshall [38] in many works [39][40][41][42][43] in order to successfully predict the gas-liquid heat transfer in bubbly flows. Advanced models for swarm heat transfer coefficient are scarce, Gunn [44] developed a correlation for heat transfer coefficient with an eye on particle cluster heat transfer.…”

Section: Interphasementioning

confidence: 99%

Computational Study of the Effect of Homogeneous and Heterogeneous Bubbly Flows on Bulk Gas–Liquid Heat Transfer

Panicker¹,

Passalacqua

Fox

2020

Journal of Fluids Engineering

View full text Add to dashboard Cite

A numerical investigation is performed on buoyancy driven homogeneous and heterogeneous bubbly flows to compare the bulk gas-liquid heat transfer effectiveness for Prandtl (Pr) numbers 0.2 - 20 and bubble void fractions 0.3 - 0.5. For this purpose, transient two-fluid model simulations of bubbles rising in a stagnant pool of liquid are conducted in a rectangular box by applying periodic boundary conditions to all the sides. The temperature difference between gas and liquid phase is averaged over the rectangular box and monitored with respect to time, the heat transfer rate is studied based on the time at which the temperature difference tends to zero. The results of numerical study show that at low Pr numbers, faster decay of temperature difference is observed for homogeneous flow of bubbles indicating higher heat transfer rate in comparison with the heterogeneous flow of bubbles for the same void fraction. On the contrary, for high Pr numbers higher heat transfer rate is observed in heterogeneous flow compared to the homogeneous. The comparison of heat transfer behavior between different void fraction for heterogeneous flow show that, for low Pr numbers higher heat transfer rate is achieved for void fraction 0.4 in comparison with void fraction 0.5. And for high Pr numbers, higher heat transfer is observed for void fraction 0.5 in comparison with void fraction 0.4.

show abstract

“…Bubble diameter and flow patterns play a major role in the performance of a PBR. The sparger governs bubble size and it affects flow patterns based on the velocity the gas leaves the sparger and the direction it leaves . Small diameter bubbles decrease growth and productivity because the size of the PO and the bubble size are similar.…”

Section: Large‐scale Cultivation Systems For Microalgae and Cyanobactmentioning

confidence: 99%

Photobioreactor cultivation strategies for microalgae and cyanobacteria

Johnson

Katuwal

Anderson

et al. 2018

Biotechnology Progress

Self Cite

View full text Add to dashboard Cite

The current burden on fossil-derived chemicals and fuels combined with the rapidly increasing global population has led to a crucial need to develop renewable and sustainable sources of chemicals and biofuels. Photoautotrophic microorganisms, including cyanobacteria and microalgae, have garnered a great deal of attention for their capability to produce these chemicals from carbon dioxide, mineralized water, and solar energy. While there have been substantial amounts of research directed at scaling-up production from these microorganisms, several factors have proven difficult to overcome, including high costs associated with cultivation, photobioreactor construction, and artificial lighting. Decreasing these costs will substantially increase the economic feasibility of these production processes. Thus, the purpose of this review is to describe various photobioreactor designs, and then provide an overview on lighting systems, mixing, gas transfer, and the hydrodynamics of bubbles. These factors must be considered when the goal of a production process is economic feasibility. Targets for improving microalgae and cyanobacteria cultivation media, including water reduction strategies will also be described. As fossil fuel reserves continue to be depleted and the world population continues to increase, it is imperative that renewable chemical and biofuel production processes be developed toward becoming economically feasible. Thus, it is essential that future research is directed toward improving these processes. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:811-827, 2018.

show abstract

Hydrodynamic and Heat Transfer Effects of Different Sparger Spacings Within a Column Photobioreactor Using Computational Fluid Dynamics

Cited by 4 publications

References 0 publications

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Modeling and Simulation of Photobioreactors with Computational Fluid Dynamics—A Comprehensive Review

Computational Study of the Effect of Homogeneous and Heterogeneous Bubbly Flows on Bulk Gas–Liquid Heat Transfer

Photobioreactor cultivation strategies for microalgae and cyanobacteria

Contact Info

Product

Resources

About